@misc{indiciaee644b95075d0,
  title = {Aeromagnetic map of the Custer-Rapid City area, southwestern South Dakota},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1969},
  doi = {10.3133/gp670},
  url = {https://pubs.usgs.gov/publication/gp670},
  note = {Source identifier: gp670}
}